Gabriel_2018

Yes, I agree, but the question was clear. I don´t know if @Kilowatt Power wants other kinds of advice. 
If I were in that situation, depending on the amount of water per day needed, I would install the next:
 
7-8 Kwp pannel and a 11 KW VFD. I would limit frequency to 40-42 Hz in order to reduce the power needed, being sure that the refrigeration of motor is enough.  Power would be 4-5 kW and flow rate 5 m3/h. 
If it is neccesary, at night, I would feed AC IN in the same VFD whith a pair of Axperts in parallel and an Autotransoformer, 230-400 W 5 KVA, whith the same frequency. Also, an inductance is needed after VFD, since the line is too long. Concerning batteries, 20 kwh LiFePo4 could be enough. 
The autotransformer has two functions, increases voltage, and avoid spikes from VFD to inverter.
 
 
 

I think the motor we are talking about is inside this table:
As you can see start current is 123 A...¿How many Axperts do you need?  😉😉

I LOVE this video:
 

Hi all!
I share with you a very low cost radiation sensor I have installed at home. It is only needed a small sollar panel, 5w 18 Vo, a ESP32 and a pair of 10 ohm resistors.
Here you have the scheme:
You can see my radiation sensor online on this web:
beduino.sytes.net/www/radiation.php
Iy you are interested i can send the code for esp32.
We´ve got a cloudy day and it is funny.

I LOVE this video:
 

I think the motor we are talking about is inside this table:
As you can see start current is 123 A...¿How many Axperts do you need?  😉😉

Yes, I agree, but the question was clear. I don´t know if @Kilowatt Power wants other kinds of advice. 
If I were in that situation, depending on the amount of water per day needed, I would install the next:
 
7-8 Kwp pannel and a 11 KW VFD. I would limit frequency to 40-42 Hz in order to reduce the power needed, being sure that the refrigeration of motor is enough.  Power would be 4-5 kW and flow rate 5 m3/h. 
If it is neccesary, at night, I would feed AC IN in the same VFD whith a pair of Axperts in parallel and an Autotransoformer, 230-400 W 5 KVA, whith the same frequency. Also, an inductance is needed after VFD, since the line is too long. Concerning batteries, 20 kwh LiFePo4 could be enough. 
The autotransformer has two functions, increases voltage, and avoid spikes from VFD to inverter.
 
 
 

It is not as you say. Starting, It will be:
KVA = 415 * In * 8 * 1.71/1000
KW = 415 * In * 8 * 1.71 * 0.25/1000
You have to consider cos phi will be round 0.25 at start.
Inrush current will be much higher that you measured, round 8 times nominal current.

As I said before, you only need a solar VFD and 15 Kwp of solar pannels. No batteries, no charger, no inverters...
https://www.zuendo.com/ls-solar-trifasico-380-v/2863-variador-de-frecuencia-solar-trifasico-11-kw-ls.html
 

It is not as you say. Starting, It will be:
KVA = 415 * In * 8 * 1.71/1000
KW = 415 * In * 8 * 1.71 * 0.25/1000
You have to consider cos phi will be round 0.25 at start.
Inrush current will be much higher that you measured, round 8 times nominal current.

Mmm. You would need 415x1.73*77.6, or 55 KVA... You only need a DC VFD, no inverter is needed 

I show an screen copy and a short screen video of software in development, the video is in .flv format. The tests so far have been satisfactory.
2019-08-17 12-16-59.flv

Good luck JACO! My best wishes!

I think it woud be better to use a SSR when the system is floating. Or, if the charger has divert signal, as FM80, directly use the ssr via FM80 signal. The advantage is that it is possible to feed geyser in absortion stage. 

Essentially a mirror signal to the PWM that drives the MPPT's buck converter? That is rather brilliant 🙂
(Probably a bit more complex than that, especially if the converter is interleaved, but the basic idea is to switch the dead-time into a heating element).

I think it woud be better to use a SSR when the system is floating. Or, if the charger has divert signal, as FM80, directly use the ssr via FM80 signal. The advantage is that it is possible to feed geyser in absortion stage. 

Yes, Infini V is able to do what you say. It has an advantage, that is that injects to grid+load, so, not all the energy necessary for loads  pass throuhg inverter. Then, if you have a 6 kw load, 2 comes from grid and 4 from Infini.
The conts are, like other older Axperts, the 60 V limit, float bugs...
Also, you can´t set the max battery current when a load is fed by Inverter+Grid.

I agree with Javi. I had this in my box of tricks. Connect the battery to the charger for a few seconds, remove and connect the cables. No more sparks of doom.

I think It could be done in a Big scale.
Thousands of panels close to a hydro-electric plant.

You are right about using a gear or a servo valve. But there is a problem, you have to consider that the source is  delayed respect the load.
So, if I were you,  I would install a small battery in order to stabilize the system, targetting battery Voltage using a PID control.
Also, as Elbow mention, you need a Big mass of water.
Finally, with a PSMM pump and a Kaplan turbine you could have +-60% efficiency.

hot, very hot, a chilate de pollo special - it burned right through... 🤪

I think it's dying of loneliness   Perhaps a fuse per string would be in order.

Hi PanB, i´ll tell you my PlanA for this kind of installs. Here, in Spain, is a very repetitive case when someone who has a house and some trees, need a borehole to water. 
We are going to suppose your pump is a 1.5 kW 3X400 VAC motor. In that case, peak start current would be 6 or 8 times nominal current, so you would need a very powerful low frecuency, which use to be not cheap. SMA, Schneider...
What I ussually do is to install an isolated transformer, which rises voltage from monophase inverter to 380-400 V, which feed a VFD, driver, which obtains 3x400 VAC from 1x400 Vac, that comes from the output of transformer. This scheme allows you to reduce start current to 1.5-2.0 nominal current.
Also, it allows you to modify the frecuency of pump motor, in order to adjust solar power to pump power. As example, if your pump is taking 2 Kw at 50 Hz, and you modify frequency via VFD to 45 Hz, the power needed would reduce to (45/50)x(45/50)*(45/50)x2 Kw = 1.45 Kw. 
 
80

Hi PanB, i´ll tell you my PlanA for this kind of installs. Here, in Spain, is a very repetitive case when someone who has a house and some trees, need a borehole to water. 
We are going to suppose your pump is a 1.5 kW 3X400 VAC motor. In that case, peak start current would be 6 or 8 times nominal current, so you would need a very powerful low frecuency, which use to be not cheap. SMA, Schneider...
What I ussually do is to install an isolated transformer, which rises voltage from monophase inverter to 380-400 V, which feed a VFD, driver, which obtains 3x400 VAC from 1x400 Vac, that comes from the output of transformer. This scheme allows you to reduce start current to 1.5-2.0 nominal current.
Also, it allows you to modify the frecuency of pump motor, in order to adjust solar power to pump power. As example, if your pump is taking 2 Kw at 50 Hz, and you modify frequency via VFD to 45 Hz, the power needed would reduce to (45/50)x(45/50)*(45/50)x2 Kw = 1.45 Kw. 
 
80

The job of the breaker is to protect the cable. The changeover switch is an isolator at best with no overcurrent protection. So that is the first thing to keep in mind. For the most part I would advise individual breakers to protect each path, and just label them properly so people know that both need to be turned off.
Change-over switches also don't like to be switched under load.
I generally do this:
----------- FROM MAIN BOARD ---------------> | | |Changeover |---> RCD ----> Other circuits FROM INVERTER -----> BREAKER --> | | ----------- In my main board I then have a breaker for the SUB-DB... so that is pretty close to your first option, except I put the breaker from the main board IN the main board.